基于Voronoi有限元方法的滾動軸承疲勞壽命分析
[Abstract]:Rolling bearing is widely used and is an important part of mechanical foundation. It is of great significance to predict the life of rolling bearing. The failure mode of rolling bearing is mainly the contact fatigue failure of rolling bearing, and the failure of micro material is considered to be one of the main causes of contact fatigue failure of rolling bearing. Therefore, it is very important to establish the micro accurate model of rolling bearing. At the micro level, the rolling bearing material is polycrystalline, its grain has different shape and size, but the element of traditional finite element software can not simulate this characteristic, so, In this paper, a finite element analysis method based on Voronoi method is proposed to predict the fatigue life of rolling bearing. The main contents of this paper are as follows: 1. The accurate model of rolling bearing based on Voronoi method is established on the ANSYS platform by using the method of mixing MATLAB and ANSYS. In this model, Voronoi polygon is used to represent the grain of rolling bearing material, and the microstructure is successfully introduced into finite element model. Twenty Voronoi finite element models with different microstructure are established, and Hertz contact stress is applied to the model. The stress of rolling bearing is obtained by simulation, and the simulation results are processed as follows: the contact fatigue life accords with Weibull distribution; The inhomogeneity of material properties will lead to the increase of fatigue life dispersion of rolling bearings. The initial defect of the material will reduce the fatigue life of rolling bearing and increase the life dispersion. 3. Based on the theory of damage mechanics, The damage mechanics constitutive relation of rolling bearing is established and the damage mechanics model of rolling bearing based on Voronoi method is established on ANSYS software. The contact fatigue life of rolling bearings is predicted by applying Hertz contact stress to the model. The results are compared with those obtained by Gazizulin et al and L-P theory. The method is suitable for the fatigue life analysis of rolling bearings.
【學(xué)位授予單位】:昆明理工大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TH133.33
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